2AIH

1H-NMR solution structure of a trypsin/chymotrypsin Bowman-Birk inhibitor from Lens culinaris.

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D TOCSY	1 mM LCTI, unbuffered solution, 90% H2O, 10% D2O	90% H2O/10% D2O	3 mM	3.0	ambient	288
2	2D TOCSY	1 mM LCTI, unbuffered solution, 90% H2O, 10% D2O	90% H2O/10% D2O	3 mM	3.0	ambient	293
3	2D TOCSY	1 mM LCTI, unbuffered solution, 90% H2O, 10% D2O	90% H2O/10% D2O	3 mM	3.0	ambient	298
4	2D TOCSY	1 mM LCTI, unbuffered solution, 90% H2O, 10% D2O	90% H2O/10% D2O	3 mM	3.0	ambient	303
5	2D TOCSY	1 mM LCTI, unbuffered solution, 90% H2O, 10% D2O	90% H2O/10% D2O	5 mM	4.2	ambient	298
6	2D TOCSY	1 mM LCTI, unbuffered solution	100% D2O	3 mM	3.0	ambient	298
7	2D NOESY	1 mM LCTI, unbuffered solution, 90% H2O, 10% D2O	90% H2O/10% D2O	3 mM	3.0	ambient	298
8	DQF-COSY	1 mM LCTI, unbuffered solution, 90% H2O, 10% D2O	90% H2O/10% D2O	3 mM	3.0	ambient	298
9	DQF-COSY	1 mM LCTI, unbuffered solution	100% D2O	3 mM	3.0	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AMX	600

NMR Refinement
Method	Details	Software
simulated annealing molecular dynamics matrix relaxation energy minimization	the structures are based on a total of 2745 restraints, of which 632 are NOE-derived distance constraints for the initial stage of Simulated Annealing, 2068 are NOESY-derived cross-peak volumes for final refinement, 29 vicinal coupling constants restraints, 16 distance restraints for hydrogen bond definitions; The chloride atoms at the end of each model were added during the refinement stage of restrained energy minimization to reduce overall charge. Positions are not experimentally determined but are a result of calculations	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	back calculated data agree with experimental NOESY spectrum
Conformers Calculated Total Number	52
Conformers Submitted Total Number	20
Representative Model	1 (closest to the average)

Additional NMR Experimental Information
Details	NOESY experiments were performed at 298 K at three different mixing times (0.080s, 0.120s, 0.350s) for distance restraints calculations and cross-peak volume measurements

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2.6
2	processing	XwinNMR	2.6
3	data analysis	Sparky	3.106	Goddard, T.D. and Kneller, D.G.
4	refinement	X-PLOR	3.1851	Brunger, A.T.
5	iterative matrix relaxation	X-PLOR	3.1851	Brunger, A.T.